netbird/proxy/internal/middleware/logging.go

package middleware

import (
	"net/http"
	"time"

	log "github.com/sirupsen/logrus"
)

// responseWriter wraps http.ResponseWriter to capture status code
type responseWriter struct {
	http.ResponseWriter
	statusCode int
	written    int64
}

func (rw *responseWriter) WriteHeader(code int) {
	rw.statusCode = code
	rw.ResponseWriter.WriteHeader(code)
}

func (rw *responseWriter) Write(b []byte) (int, error) {
	n, err := rw.ResponseWriter.Write(b)
	rw.written += int64(n)
	return n, err
}

// Logging middleware logs HTTP requests with details
func Logging(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()

		// Wrap the response writer
		wrapped := &responseWriter{
			ResponseWriter: w,
			statusCode:     http.StatusOK,
		}

		// Call the next handler
		next.ServeHTTP(wrapped, r)

		// Log request details
		duration := time.Since(start)

		log.WithFields(log.Fields{
			"method":      r.Method,
			"path":        r.URL.Path,
			"status":      wrapped.statusCode,
			"duration_ms": duration.Milliseconds(),
			"bytes":       wrapped.written,
			"remote_addr": r.RemoteAddr,
			"user_agent":  r.UserAgent(),
		}).Info("HTTP request")
	})
}